feat(toys-release): Support different options for collisions during file copies

[dazuma]

No description provided.

[Copilot]

Pull request overview

This PR adds support for different collision handling strategies when copying files during the release pipeline execution. The feature allows users to specify how to handle situations where a file or directory being copied already exists at the destination.

• Introduces a collisions parameter with three options: "error" (default), "replace", and "keep"
• Updates both declarative configuration (via repo settings) and imperative API (step methods)
• Directory-on-directory collisions always merge, while other collision types respect the specified mode

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
toys-release/toys/.test/test_repo_settings.rb	Improved test description from class name to behavior description
toys-release/toys/.test/test_pipeline.rb	Comprehensive test coverage for collision handling in both input pulling and output pushing scenarios
toys-release/toys/.lib/toys/release/repo_settings.rb	Added collisions field to InputSettings and OutputSettings classes with default value "error"
toys-release/toys/.lib/toys/release/pipeline.rb	Implemented collision handling logic in copy_tree method and added collisions parameter to copy_from_input and copy_to_output methods

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